LT3650-4.1/LT3650-4.2 - High Voltage 2 Amp …

1 ApplicaTionThe LT 3650 is a complete monolithic single-cell Li-Ion/Polymer battery charger that operates over a to 32V input Voltage range ( minimum start-up Voltage ). The lt3650 provides a constant-current/constant- Voltage charge characteristic, with maximum charge current externally programmable up to 2A, set using an external current sense resistor. A precondition feature trickle-charges a low Voltage battery, and bad-battery detection provides a signal and suspends charging if a battery does not respond to preconditioning. The lt3650 can be configured to terminate charging when charge current falls to C/10, or one-tenth the programmed maximum current.

2 Once charging is terminated, the lt3650 enters a low current (85 A) standby mode. An auto-restart feature starts a new charging cycle if the battery Voltage drops from the float Voltage , or if a new battery is inserted into a charging lt3650 contains a user-programmable internal safety timer (typically set to a three hour full cycle time). The IC can be configured to use this internal timer if a time-based termination scheme is desired in which charging can con-tinue below C/10 until a desired time is lt3650 is available in a low profile ( ) 3mm 3mm 12-pin DFN and 12-pin MSOP Voltage 2 Amp Monolithic Li-Ion Battery to 32V Single-Cell Li-Ion 2A Chargern Wide Input Voltage Range: to 32V (40V Absolute Maximum)n Programmable Charge Current Up to 2An User-Selectable Termination.

3 C/10 or Onboard Termination Timern Dynamic Charge Rate Programming/Soft-Start Pinn Programmable Input Current Limitn No VIN Blocking Diode Requiredn 1 MHz Fixed Frequencyn Average Current Mode Controln Float Voltage Accuracyn 5% Charge Current Accuracyn C/10 Detection Accuracyn NTC Resistor Temperature Monitorn Auto-Recharge at Float Voltagen Auto-Precondition at <70% Float Voltagen Bad-Battery Detection with Auto-Resetn Binary Coded Open-Collector Status Pinsn 3mm 3mm DFN-12 or MSOP-12 Packagen Industrial Handheld Instrumentsn 12V to 24V Automotive and Heavy Equipmentn Desktop Cradle Chargersn Notebook Computers3650 to 32 VCLPRNG/SSBOOSTSENSEBATNTCTIMERCMPSH1-4 CMSH3-40MA1 F10 10 +SHDNCHRGFAULTVB AT and Efficiency vs IB ATSPELL CHECK COMPLETEDIBAT (A)VBAT (V)0 EFFICIENCY (%)8090100365042 = 12 VVIN = 20VL, LT, LT C, LT M, Linear Technology, PowerPath and the Linear logo are registered trademarks of Linear Technology Corporation.

4 All other trademarks are the property of their respective MaxiMuM raTingsVIN ..40 VSHDN, CHRG, FA U LT ..VIN + , 40 VCLP ..VIN , 40 VSW ..40 VSW-VIN ..SW + 10V, 50 VSENSE, BAT ..10V(Note 1)orDer inForMaTionLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE # #TRPBFLFGQ12-Lead Plastic DFN (3mm 3mm) 40 C to 85 # #TRPBFLFGQ12-Lead Plastic DFN (3mm 3mm) 40 C to 85 # #TRPBFLDDS12-Lead Plastic DFN (3mm 3mm) 40 C to 85 # #TRPBFLDDS12-Lead Plastic DFN (3mm 3mm) 40 C to 85 # #TRPBF36504112-Lead Plastic MSOP 40 C to 85 # #TRPBF36504112-Lead Plastic MSOP 40 C to 85 # #TRPBF36504212-Lead Plastic MSOP 40 C to 85 # #TRPBF36504212-Lead Plastic MSOP 40 C to 85 CConsult LT C Marketing for parts specified with wider operating temperature ranges.

5 *The temperature grade is identified by a label on the shipping LT C Marketing for information on nonstandard lead based finish more information on lead free part marking, go to: For more information on tape and reel specifications, go to: .. to , RNG/SS, NTC .. Junction Temper atur e Range (Note 2) .. 40 C to 125 CStorage Temper atur e Range .. 65 C to 150 CLead Temper atur e (Soldering, 10 sec) MSE ..300 CTOP VIEWDD PACKAGE12-LEAD (3mm 3mm) PLASTIC DFN121189104513321 SWBOOSTSENSEBATNTCRNG/SSVINCLPSHDNCHRGFA ULTTIMER67 TJMAX = 125 C, JA = 43 C/W, JC = 3 C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB123456 VINCLPSHDNCHRGFAULTTIMER121110987 SWBOOSTSENSEBATNTCRNG/SSTOP VIEW13 MSE PACKAGE12-LEAD PLASTIC MSOP TJMAX = 125 C, JA = 43 C/W, JC = 3 C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCBpin VINVIN Operating Range VIN Start Voltage (Note 3)l VVIN(OVLO)OVLO Threshold OVLO HysteresisVIN Risingl3235 140V VVIN(UVLO)UVLO Threshold UVLO HysteresisVIN VVBAT(F LT)

6 Battery Float V VRECHRGR echarge Battery ThresholdThreshold Voltage Relative to VBAT(F LT) 100mVVBAT(PRE)Battery Precondition Threshold VoltageVBAT (PREHYST)Battery Precondition Threshold Hysteresis90mVIVINO perating Input Supply CurrentCC/CV Mode, ISW = 0 Standby Mode Shutdown (SHDN = 0) 85 A AIBOOSTBOOST Supply CurrentSwitch-On, ISW = 0 < V(BOOST SW) < 20 mAIBOOST/ ISWBOOST Switch Drive ISW = 2A30mA/AVSW(ON)Switch-On Voltage Drop VIN VSW, ISW = 2A350 mVISW(MAX)Switch Current (PRE)Precondition Current Sense VoltageVSENSE VBAT VBAT = (DC)CLP Threshold VoltageVCLP VIN; VSENSE VBAT = Input Bias Current200nAVSENSE(DC)Maximum Current Sense VoltageVSENSE VBAT; VBAT = , VRNG/SS = (C/10)C/10 Trigger Sense Input Bias CurrentCharging AISENSESENSE Input Bias CurrentCharging AIREVERSEC harger Reverse Current: IBAT + ISENSE + ISWVIN = 0V.

7 BAT = SENSE = SW = VBAT(F LT)1 AVNTC(H)NTC Range Limit ( high )VNTC (L)NTC Range Limit (Low)VNTC (HYST)NTC Threshold Hysteresis% of Threshold20%RNTC(DIS)NTC Disable ImpedanceMinimum External Impedance to GNDl250500k INTCNTC Bias CurrentVNTC = AIRNG/SSIRNG/SS Bias Currentl455055 AVRNG/SS/ VSENSEC urrent Limit Programming: VRNG/SS/VSENSE(MAX)VRNG/SS = (HYST)Shutdown Hysteresis120mVISHDNSHDN Input Bias Current 10nAelecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at VIN = 20V, BOOST-SW = 4V, SHDN = 2V, SENSE = B AT = VB AT(F LT), CTIMER = ( C) 5065 IVIN CURRENT ( A)7075801009005075365042 G029585 2525100 VRNG/SS00 ICHG(MAX) (%) ( C) 50 VBAT(FLT) (%)050753650 2525100125 Typical perForMance characTerisTicsBattery Float Voltage vs TemperatureVIN Standby Mode Current vs TemperatureMaximum Charge Current vs IRNG/SS Voltage , ICHG(MAX)

8 As a Percentage of Programmed IMAXTA = 25 C, unless otherwise 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The LT3650E is guaranteed to meet performance specifications from 0 C to 85 C. Specifications over the 40 C to 85 C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LT3650I specifications are guaranteed over the full 40 C to 85 C temperature range. high junction temperatures degrade operating 3.

9 VIN voltages below the start threshold are only supported if (VBOOST VSW) > characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at VIN = 20V, BOOST-SW = 4V, SHDN = 2V, SENSE = B AT = VB AT(F LT), CTIMER = , VFAULTS tatus Low Voltage10mA Loadl Current25 AVTIMER(DIS)Timer Disable Charge Cycle Timeout3hrPrecondition Accuracyl 1010%fOOperating Cycle RangeContinuous Operationl1590% (V)0 (mA) (A)0 ISW/IBOOST G04 TEMPERATURE ( C) 50320 SWITCH FORWARD DROP (mV)34036038048042005075365042 G05440460400 2525100125 ISW = 2 ASwitch Drive (ISW/IBOOST) vs ISWS witch Forward Drop (VIN VSW) vs TemperatureTEMPERATURE ( C) VBAT (mV) 2525100125 VBAT = ( C) 508 VSENSE VBAT (mV)910111205075365042 G07 2525100125 TEMPERATURE ( C)0 VSENSE VBAT (mV)408020601001204565851051253513525557 595115365042 G10 Typical perForMance characTerisTicsIMAX Current Limit (VSENSE VB AT) vs TemperatureC/10 Threshold (VSENSE VB AT) vs TemperatureCC/CV Charging.

10 SENSE Pin Bias Current vs VSENSET hermal Foldback IMAX Current Limit (VSENSE VB AT) vs Temperature TEMPERATURE ( C) VIN (mV) 2525100125 CLP Input Limit Threshold (VCLP VIN) vs Temperature, ICHG at 50%CC/CV Charging; B AT Pin Bias Current vs VB ATBattery Bias Current with Charger Disabled (IB AT + ISENSE + IBOOST + ISW)VSENSE (V)0 350 ISENSE ( A) 250 150 300 200 = 25 C, unless otherwise = 20V, VSHDN = 0 VVIN FLOATINGVBAT (V) 0 BATTERY CURRENT ( A) FuncTionsVIN (Pin 1): Charger Input Supply. VIN pin operating range is to 32V. VIN or (VBOOST VSW) > 2V is required for start-up.